Discharging device for containers for pulverised material



W. HERMANNS July 6, 1965 DISCHARGING DEVICE FOR CONTAINERS FOR PULVERISED MATERIAL Filed June 3, 1965 3 Sheets-Sheet l MyWfA/"MAM.

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DISCHARGING DEVICE FOR CONTAINERS FOR PULVERISED MATERI AL Filed June 3,-1963 5 Sheets-Sheet 2 n venfar W011, MM

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DISCHARGING DEVICE FOR CONTAINERS FOR FULVERISED MATERIAL Filed June 3, 1963 3 Sheets-Sheet 3 1/? vemor. @Jmm. M

United States Patent 3,193,332 DISCHARGING DEVICE FOR CQNTAINERS FOR PULVERESED MATERIAL Wilhelm Hermanns, 644 Frankfurter Strasse, Porz-Urbach, Germany Filed .lune 3, 1963, Ser. No. 284,918 Claims priority, application Germany, June 8, 1962, H 45,6309 Claims. (Qt. 392- 52) The invention relates to discharging devices for receptacles for pulverised material, the device comprising loosening tubes which extend along the receptacle base and which are kept fiat by horizontal inserts and which are secured at one of their ends on tubular connectors which extend into the receptacle and which are borne by a partition therein, compressed air being blown into the receptacle through the porous walls of the loosening tubes.

In the known discharging devices of this kind, the tubes are secured on tubular connectors of circular cross-section which are borne by the partition in the receptacle and in which the distance between centres is substantially equal to the width of the tubes lying flat on the receptacle base. Consequently, a relatively high and wide space from which the pulverised material cannot be made to discharge is left between adjacent tubular connectors.

According to a main feature of the invention for obviat ing this disadvantage, the tubular connectors have a substantially flat oval cross-section and are introduced, with their major axes parallel with the receptacle base, into correspondingly shaped flat oval apertures with which the partition is formed and which are disposed immediately above the receptacle base. The term fiat oval is used to describe a cross-section in which the oval is characterized by a material difference between the major and minor axes. This results in a flatness which presents a maximum of surface under the material and broadens the area of agitation. In like manner as shown in FIGURE 2, the underside flattens out, reducing the area between the tubes and in which material might otherwise lodge out of the path of movement of the compressed air. In cases Where the tubes lying on the receptacle base are kept fiat by horizontal inserts in them, the cross-section of the tubular connectors which bear the tubes is chosen to correspond to the cross-section of the tubes kept fiat by the inserts, in which event the flat oval apertures with which the partition is formed and which is adapted to receive the tubular connectors are so close together that there is contact between the walls of the tube parts disposed on the tubular connectors.

Even in discharging devices of this kind, the compressed air must reach the end of the tube-bearing connectors before issuing from the tube walls, and so, to prevent any pulverised material from remaining on the tubular connectors or on the tube parts fitted thereto, a tube which has an air-previous wall and which is also supplied with compressed air can in known manner be disposed above the other tubes and extend thereover; according to the invention, this extra or cover tube is, like the other tubes, kept fiat by an insert and is connected to a tubular member which has a flat oval cross-section and which is disposed immediately above the other tubular members. Residues of pulverised material above the tubular connectors bearing the loosening tubes are therefore reduced very considerably.

An embodiment of a discharging device for receptacles for pulverised material according to the invention is illustrated in the drawings wherein:

FlG. 1 is a vertical longitudinal sectional view through a receptacle having a discharging device according to the invention;

FIG. 2 is a vertical cross-section through the receptacle, taken along the line IIII of FIG. 1;

FIG. 3 is a side elevation, to an enlarged scale, through the tube connections partly in section;

FIG. 4 is a side elevation of the bottom part of the partition which is adapted to receive the tubular connectors and which bounds a compressed air distribution chamber in the receptacle;

FIG. 5 is a perspective view of one of the tubular connectors adapted to be placed in the partition, and

FIG. 6 is a horizontal sectional view taken along the line Vl-VI of FIG. 3.

A receptacle 1 for pulverised material as shown in FIG. 1 has a discharge aperture 2 at its end. Loosening tubes 4 having porous walls extend along base 3 of receptacle 1; compressed air is forced through the walls of the tubes 4 into the pulverised material so that the same is discharged through the exit 2 when the receptacle 1 is only very slightly tilted. Compressed air is supplied to the tubes 4 at that end of the receptacle 1 which is remote from the exit 2. The entering air flows through the oval tubes 4 which cover the receptacle base 3 and which are located thereon with their vertices contiguous. The ends la of the central tubes 4 are drawn inwards as far as the exit 2 where they are secured to the wall or" the tubular part of the exit. The other tubes 4 extend past the exit 2 as far as end wall 5 which closes the receptacle 1 at the exit. In this region the tube ends 41) are secured adjacent one another in the bottom part of the end Wall 5. At the other end wall 6 of the receptacle 1, a compressed air distribution chamber '7 to which compressed air is supplied from outside is separated oit from the rest of the receptacle by a partition 8 whose upper part slopes to an angle corresponding at least to the angle of repose of the pulverised material, the same therefore sliding down over this inclined part of the partition 8. If the inclined part thereof terminates below the centre of the end wall 6, all the pulverised material accumulating thereon will slide down the sloping part of the partition 8. If the end wall 6 is curved as in the present embodiment, the inclined part merely needs to be disposed below the most forwardly curved part of the end wall 6.

Tubular connectors 9 (shown to an enlarged scale in FIG. 3) are received in the vertical part of the partition 3 above the receptacle base 3. The ends of the tubes 4 are pushed over the connectors 9 and secured by means of clips 19. Disposed inside the connectors 9 are rails 11 which extend outwards in the form of solid inserts 12 for the tubes 4; the inserts 12 extend over the whole length of the tubes 4 and keep the same fiat; preferably, the top of the inserts is formed with longitudinal ribs which form air channels even when the tubes are weighed down by the pulverised material.

As is best seen in FIG. 5, the tubular connectors 9 in the bottom part of the partition 8 have a flat oval crosssection and are welded, with the major axis of the oval parallel with the receptacle base 3, into matching flat oval apertures 17 in the partition 8; the apertures 17 are very near the base 3 and are at a spacing from one another such that there is contact between the walls of the tube parts fitted to the connectors 9, in the manner shown in FIG. 6. In the embodiment illustrated, therefore, the distance between centres of the connectors 9 corresponds to the width of the tubes 4 kept flat by the inserts 12.

Those ends of the tubes 4 which are pushed over the air-impervious connectors 9 are covered by another flexible tube 13 which is also connected to the chamber 7 and which extends transversely over all the connectors 9 and whose wall is porous, just like the tubes 4. The com pressed air issuing from the tube 13 mixes with the pulverised material sliding down the inclined part of the 3 partition 8 and prevents such material from the tubeends above the connectors 9.

The connection of the tube 13 to the chamber 7 is shown to an enlarged scale in FIG. 3. Above the connectors 9, a screwthreaded tubular connecting member 14 is welded into the partition 8 and has screwed onto it a tube bond 15 whose free end bears a tubular member 16 parallel with the partition 8. The tubular member 16 has a flat oval cross-section and is disposed closely above the connectors 9. One half of the cover tube 13 is secured to the'endsof the tubular member 16 on each side of the bend 15, each such half extending by way of the conremaining on nection place for the tubes 4 of the particular side construct-ion of the connectors 9, all help to reduce the chance of pulverised material remaining stationary near the places where the tubes 4 are connected.

, I claim: a

1. In combination a vessel having a discharge at one end of the vessel bottom, a partition at the other end of the bottom, a series of parallel, flexible air-permeable tubes extending from said partition longitudinally over the bottom, and means located at the discharge end of said vessel for securing said tubes to the vessel, said tubes being oval in cross-section with their vertices in contact.

2. In combination a vessel having a discharge at one end of the vessel bottom, a partition at the other end of the bottom, a series of parallel, flexible air-permeable tubes. extending from said partition longitudinally over the bottom, and means located at the discharge end of said vessel for securing said tubes to the vessel, said tubes being oval in cross-section with their lower surfaces 4 flattened into contact with the vessel bottom and with their vertices in contact.

3. In combination a vessel having a discharge at one end of the vessel bottom, a partition at the other end of the bottom, a series of parallel, flexible air-permeable tubes extending longitudinally over the bottom, means located at the discharge end of said vessel for securing said tubes to the vessel, said tubes being oval in crosssection with their vertices in contact, and a series of tubular connectors mounted on said partition and being opposite the ends of said tubes, said connectors having mating oval cross-sections with said tubes and having their vertices so adjacent to one another that the vertices of the portions of said tubes which surround said connectors are contiguous.

4. In combination a vessel having a discharge at one end of the vessel bottom, a partition at the other end of I the bottom, a series of parallel, flexible air-permeable tubes extending longitudinally over the bottom, means located at the discharge end of said vessel for securing of oval cross-section arranged transversely above the connectors and having a supporting connection through thepartition. 7

l 5. The combination as defined in claim 4, wherein said tubes are kept flattened by horizontal inserts located therein. 7

References Cited by the Examiner UNITED STATES PATENTS 3,024,072 3/62 Hermanns 30252 SAMUEL F. COLEMAN, Primary Examiner. ANDRES H. NIELSEN, Examiner 

1. IN COMBINATION A VESSEL HAVING A DISCHARGE AT ONE END OF THE VESSEL BOTTOM, A PARTITION AT THE OTHER END OF THE BOTTOM, A SERIES OF PARALLEL, FLEXIBLE AIR-PERMEABLE TUBES EXTENDING FROM SAID PARTITION LONGITUDINALLY OVER THE BOTTOM, AND MEANS LOCATED AT THE DISCHARGE END OF SAID 